Membrane emulsification and solvent pervaporation processes for the continuous synthesis of functional magnetic and Janus nanobeads

Langmuir : the ACS Journal of Surfaces and Colloids
Emily P Chang, T Alan Hatton

Abstract

We discuss the integration of membrane emulsification and pervaporation processes for the continuous production of functional materials, such as silica-encapsulated magnetite nanoparticle clusters and asymmetric Janus nanoparticles, by the emulsion droplet solvent evaporation method, which has traditionally been performed in small-scale batch systems. An organic solvent containing primary magnetite nanoparticles (∼10 nm) coated with oleic acid was dispersed in a continuous aqueous phase by membrane emulsification, which enabled the consistent production of nanoparticle-laden solvent droplets of well-controlled size with narrow size distributions. The solvent was removed from the emulsion by pervaporation. Prior to complete solvent removal, the nanoparticle packing density within the clusters was a function of the residence time in the pervaporation unit. The final clusters formed, ∼100-300 nm in size, exhibited the same superparamagnetic behavior as the primary nanoparticles, and were stable in aqueous media with a zeta potential of -70 mV at neutral pH. A facile method was used to coat the nanoclusters with a silica shell, providing sites for surface functionalization with a range of organic ligands. The nanoparticles and clus...Continue Reading

References

Dec 6, 2000·Advanced Drug Delivery Reviews·T NakashimaM Kukizaki
Feb 6, 2007·Angewandte Chemie·An-Hui LuFerdi Schüth
May 14, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Tatsushi IsojimaT Alan Hatton
Dec 9, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Lev BrombergCarmen Alvarez-Lorenzo

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Citations

Sep 4, 2015·Advances in Colloid and Interface Science·Goran T Vladisavljević
Oct 15, 2013·Journal of the Science of Food and Agriculture·Fotis SpyropoulosAleksandra K Pawlik
Jul 13, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Keishi SugaHiroshi Umakoshi

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